Business structure, tax modelling and practical responsibilities
Self-Employed or Limited Company in Cardiff?
We compare the tax and commercial position using your expected profit, other income, cash needs, contracts, risk and growth plans before recommending whether to trade as a sole trader or through a limited company.
For consultants, contractors, trades, creatives, online businesses, property professionals and owner-managed ventures across Cardiff and South East Wales.
The short answer
Neither structure is automatically better
A sole trader can be the sensible route for a new, straightforward or lower-risk business where the owner needs most of the profit personally. A limited company can suit a business that needs a separate legal identity, expects to retain profit, take on owners or employees, meet client requirements or manage greater commercial risk.
Tax can change that conclusion, but a valid comparison must include Corporation Tax, salary, employer National Insurance, dividend tax, the owner's other income and the annual cost of company administration.
- You are testing an idea or trading on a modest scale
- The work has limited commercial exposure
- You need most profits for personal spending
- Simple administration is a priority
- No client or investor requires a company
- A separate contracting party is commercially useful
- Profit can remain in the business for growth
- Ownership, investment or succession matters
- There are employees, assets or greater trading risks
- The added records and filings can be maintained
Look beyond the headline tax rate
What should be reviewed before choosing?
The structure affects who owns the income, who signs the contract, how money is taken and which records become public. These points should be settled before registrations or contracts are changed.
Expected profit and how stable it is
A single strong month is not the same as sustainable annual profit. Costs, seasonality and realistic drawings should be modelled.
How much money the owner needs to withdraw
A company only defers personal extraction tax where profits genuinely remain in the company; retained cash is not personal money.
Salary, property, dividends and a spouse's position
Tax bands, allowances, student loans, benefits and pension planning can change the personal result.
Contracts, borrowing, assets and potential claims
Limited liability can help separate ordinary business debts, but guarantees, misconduct and director duties remain important.
Employees, partners, investors, sale or succession
Ownership and growth plans can make company shares useful, or make a simple sole trade more proportionate.
Records, software, accounts and filing capacity
The tax comparison should include the real cost and time of meeting each structure's continuing duties.
Advice based on your proposed trade
What a business-structure review includes
The scope depends on whether you are starting, already trading or transferring an established business. We identify the assumptions used so the recommendation can be revisited if circumstances change.
Business and contract review
We establish the activities, customers, pricing, risks, assets, funding, workers and any requirement to trade through a company.
Personal tax profile
Other income, household cash needs, Welsh taxpayer status, allowances and relevant personal obligations are included.
Side-by-side tax model
Sole-trader Income Tax and National Insurance are compared with company tax, employer costs and personal extraction.
Compliance and cost comparison
Self Assessment or MTD obligations are set against accounts, CT600, payroll, confirmation statements and company records.
Changeover consequences
Assets, stock, debtors, VAT, contracts, employees, finance and potential gains are reviewed before a transfer date is chosen.
Recommendation and actions
You receive the preferred route, key reasons, assumptions, registrations, deadlines and points needing legal or regulated advice.
The outcome is a reasoned decision rather than a generic tax-saving figure or automatic instruction to incorporate.
How the fee is scoped →The structural differences
Sole trader and limited company compared
The table is a starting point. The recommendation follows how these differences affect your actual business and personal position.
The owner and business are the same legal person.
The company is a separate legal person owned by shareholders and managed by directors.
The individual pays Income Tax and Class 4 National Insurance on taxable business profit.
The company pays Corporation Tax; the owner may then pay tax and National Insurance on salary, dividends or other extraction.
Drawings do not change taxable profit. The owner can use business cash, subject to meeting liabilities.
Company money is not personal money. Salary, dividends, expenses and loans require their correct treatment.
Business records plus Self Assessment or applicable Making Tax Digital submissions.
Statutory accounts, Corporation Tax return, company registers, confirmation statement and possibly payroll and personal returns.
No public statutory accounts, although business and tax records remain required.
Specified company, officer and accounts information is filed on the public register.
The owner is personally responsible for business debts and obligations.
Ordinary liability generally sits with the company, subject to guarantees, director duties and exceptions.
The individual owns the business assets and transfers them individually.
Shares can represent ownership, but asset and share sales have different tax and legal outcomes.
2026/27 tax comparison
Compare the combined tax cost, not 19% against 40%
A sole trader in Wales pays Income Tax on taxable profits at the applicable Welsh rates and Class 4 National Insurance at 6% between £12,570 and £50,270, then 2% above that.
A company pays Corporation Tax at 19% for qualifying small profits up to £50,000, 25% above £250,000 and an effective marginal rate between those limits. The limits are adjusted for short periods and associated companies.
The owner can then face PAYE, employee and employer National Insurance and dividend tax. For 2026/27 the dividend allowance is £500, and dividend rates above it are 10.75%, 35.75% and 39.35% according to the individual's band.
20%, 40% and 45% Welsh rates for 2026/27, subject to allowances, bands and total income.
Welsh Income Tax rates ↗6% from £12,570 to £50,270 and 2% above £50,270 for 2026/27.
Self-employed NI rates ↗Corporation Tax before the personal cost of extracting company funds.
Corporation Tax rates ↗2026/27 rates apply after the £500 dividend allowance and depend on total taxable income.
Dividend tax rates ↗Profit and cash are not the same
How the owner takes money changes the comparison
A sole trader is taxed on taxable business profit whether the cash stays in the business bank account or is drawn personally.
A company's profit belongs to the company. Personal tax depends on how and when value is extracted, but cash retained in the company remains available only for company purposes. Loans and personal spending can create separate tax consequences.
- SalaryEmployment income through payrollUsually deductible for the company when properly incurred, with PAYE and applicable National Insurance.
- DividendDistribution from available profitsNot a company expense; requires distributable reserves, a lawful decision and dividend records.
- ExpenseReimbursement of a genuine business costRequires business purpose and evidence and is not a substitute for salary or dividends.
- PensionEmployer contribution where appropriateSubject to company purpose, pension rules and the individual's wider allowances and circumstances.
- LoanMoney owed between company and directorMust be recorded; an overdrawn account can create company and personal tax charges.
Administration is part of the cost
Records, returns and continuing responsibilities
Hiring an accountant can support the work, but the sole trader remains responsible for their return and a director remains legally responsible for the company.
- Register for Self Assessment when required
- Keep income, expense, asset and supporting records
- File Self Assessment or MTD submissions when applicable
- Pay Income Tax and National Insurance personally
- Monitor VAT and employer obligations separately
- Maintain statutory and accounting records
- Prepare and file annual company accounts
- Prepare the Corporation Tax computation and CT600
- File a confirmation statement at least annually
- Record directors, shareholders, dividends and significant changes
A significant 2026 sole-trader change
Making Tax Digital changes the administration comparison
From 6 April 2026, a sole trader or landlord generally has to use Making Tax Digital for Income Tax when qualifying gross income from self-employment and property exceeded £50,000 in 2024/25.
The threshold falls to more than £30,000 from April 2027 using 2025/26 qualifying income, and more than £20,000 from April 2028 using 2026/27 income. Those within MTD keep digital records, send quarterly updates and complete the year through compatible software.
Check when Making Tax Digital starts ↗Limited liability has limits
A company can separate risk without removing responsibility
A sole trader is personally responsible for business debts and contractual obligations. A company is normally the contracting party and owns its assets and liabilities, which can create useful separation.
That protection is not absolute. A bank, landlord or supplier may require a personal guarantee. Directors can face personal consequences for wrongful conduct, breaches of duty, unlawful dividends or trading irresponsibly around insolvency. Insurance and well-drafted contracts remain necessary whichever structure is used.
Confirm whether the individual or company is named and responsible for delivering the work.
A personal guarantee can move a company debt back to the owner if the company cannot pay.
Professional, public, product, cyber or employer cover follows the activity and risk—not simply the legal structure.
Company decisions, records and conflicts must comply with legal responsibilities even where work is delegated.
A company does not decide status
Contract + working practicesEmployment status and off-payroll treatment follow the actual engagement.Consultants and contractors
A limited company does not automatically put work outside IR35
Employment status is not chosen by the label on an invoice or contract. Control, personal service, substitution, financial risk, integration and the practical working relationship all matter.
Where services are supplied through a personal service company, the off-payroll rules can place the status decision with a public-sector or medium or large private-sector client. With a small private client, responsibility can remain with the intermediary. The engagement must be reviewed rather than assuming the company structure settles it.
Read the official off-payroll working rules ↗An existing business must be transferred
Incorporating a sole trade is more than registering a company
A new company does not automatically own the existing trade. The transfer date and legal ownership of assets, stock, debtors, contracts, employees, finance, intellectual property and liabilities should be documented.
Moving assets can trigger Capital Gains Tax, VAT, Stamp Duty Land Tax or other consequences. Incorporation Relief may defer gains when a qualifying business and its assets, except cash, are transferred in return for shares, but the conditions and commercial deal need reviewing.
Check the official Incorporation Relief conditions ↗Identify equipment, property, vehicles, stock, goodwill and intellectual property and agree their treatment.
Novate or replace contracts, update invoices and make clear which entity supplies from the changeover date.
Review registration transfer or cancellation, final sole-trader records, new company PAYE and employee transfer issues.
Separate personal drawings from company transactions and record loans or amounts introduced correctly.
Consider gains, capital allowances, losses and available reliefs before the transfer is implemented.
Close the sole-trader period correctly and begin the company's accounts, Corporation Tax and statutory records.
The work and customer base matter
Structure decisions for Cardiff businesses
Profit is only one factor. Contract terms, investment, employees, property and regulatory exposure can outweigh a small difference in the annual tax model.
Consultants, contractors and interim professionals
Client size, working practices, IR35, indemnity requirements, travel and the ability to retain profit all affect the decision.
Construction and skilled trades
CIS status, vans, tools, employees, subcontractors, site risk and main-contractor requirements should be compared together.
Designers, creators, agencies and digital services
Intellectual property, collaborators, overseas platforms, equipment and fluctuating project profit can influence timing.
Ecommerce, software and subscription businesses
Stock, platform accounts, VAT, development costs, ownership, investment and a future sale need a scalable structure.
Clinicians, therapists and care professionals
Professional regulation, insurance, NHS or agency status, exempt or taxable income and premises arrangements can be decisive.
Property services and property-owning businesses
Trading services, investment ownership, finance, gains, Stamp Duty Land Tax and personal use require separate analysis.
The comparison is only as good as its assumptions
Information needed for a structure review
We can begin with estimates for a new venture. An established business needs recent accounts or records so exceptional months are not treated as normal future profit.
Services or products, customers, contracts, pricing, location, workers, finance, assets and main commercial risks.
Turnover, direct costs, overheads, capital spending, sustainable profit and cash needed for reinvestment.
Salary, other businesses, property, dividends, pension plans, household cash needs and relevant tax obligations.
Latest accounts or tax return, current-year figures, VAT status, losses, asset register and contracts.
New owners, employees, borrowing, premises, investment, sale, succession, overseas work or a planned exit date.
Facts before registration
How we reach a structure recommendation
A company can be formed quickly, but unwinding an unsuitable structure can be costly. We make the decision before implementation wherever possible.
- 01
Establish the trade
Understand work, customers, contracts, risks, ownership and current registrations.
- 02
Set realistic assumptions
Agree forecast profit, personal cash needs, reinvestment and other household income.
- 03
Model both structures
Compare combined tax, extraction, administration and timing on the same assumptions.
- 04
Test commercial fit
Consider liability, client terms, funding, ownership, privacy and future plans.
- 05
Recommend and implement
Explain the reasons, registrations, transfer steps, records, deadlines and review triggers.
A defined scope before work begins
Business-structure advice fees
The fee follows the decision being made. A new one-person service business needs a different review from an established sole trade transferring property, staff, contracts, VAT and finance into a company.
Ask for a structure-review quoteCurrent stage
Pre-trading comparison, review of an existing structure or transfer of a live business.
Tax modelling
Profit scenarios, other income, owners, extraction routes, losses and personal considerations.
Assets and obligations
Property, goodwill, stock, employees, VAT, finance, contracts and potential transfer taxes.
Implementation
Whether registrations, company setup coordination, payroll or ongoing return work are included.
Direct answers before you decide
Self-employed or limited company questions
The answer can change with profit, personal cash needs and business plans, so these are starting points rather than automatic rules.
At what profit should I become a limited company?+
There is no universal break-even profit. The result depends on other income, cash withdrawn, salary, employer National Insurance, dividends, retained profit, associated companies and administration costs. Commercial risk and client requirements can justify a company even when the tax difference is small—or support remaining a sole trader at a higher profit.
Is a limited company always more tax efficient?+
No. The company pays Corporation Tax and the owner may then pay tax and National Insurance when money is extracted. From 6 April 2026, basic and higher dividend rates increased to 10.75% and 35.75%. A company can still be suitable, particularly where profit is retained, but the complete combined cost must be modelled.
What is the main practical advantage of being a sole trader?+
The structure is usually simpler: the individual owns the business directly, takes drawings without company distribution formalities and normally has fewer public and statutory filings. Records and tax returns are still required, and Making Tax Digital can now add quarterly obligations for qualifying income levels.
Does a limited company protect my personal assets?+
It normally separates company liabilities from the shareholder, but the protection is not absolute. Personal guarantees, director wrongdoing, unlawful distributions and insolvency conduct can create personal exposure. Contracts and insurance need independent legal or specialist review.
Can I keep using the business bank account after incorporation?+
No. The new company is a separate person and should use its own bank and accounting records. Sole-trader transactions must stop at the agreed transfer date, and later withdrawals from the company need to be recorded as salary, dividends, expenses or loans as appropriate.
Does a sole trader need to register with HMRC?+
A person generally registers as a sole trader through Self Assessment if gross trading income exceeds £1,000 in a tax year, or for certain other reasons such as CIS registration. The deadline to notify HMRC is normally 5 October after the tax year in which the obligation arose.
Will Making Tax Digital apply if I stay self-employed?+
It can. From April 2026 MTD for Income Tax applies to qualifying sole traders and landlords with gross qualifying income over £50,000 based on 2024/25. The entry threshold falls to more than £30,000 from April 2027 and more than £20,000 from April 2028.
Can I transfer my sole-trader business into a company?+
Yes, but the company must acquire the business and relevant assets and contracts. Gains, VAT, capital allowances, stock, employees, finance and legal ownership need reviewing. Incorporation Relief may defer a qualifying gain where the statutory conditions are met.
Does trading through a company avoid IR35?+
No. Off-payroll working looks at whether the individual would have been an employee if engaged directly. The written contract and actual working practices both matter, and responsibility for the decision depends partly on the client's sector and size.
Before you register or transfer contracts
Choose the structure from the business you intend to run
Tell us what the business does, expected profit, personal cash needs and future plans. We will identify the comparison required and give you a clear scope before the review begins.
Information reviewed 3 September 2026. The suitable structure depends on legal, commercial and tax facts and should be reconsidered when those facts change.